KSH has the best color selection but is also crazy expensive (in case you hadn’t noticed).

Tsuki has a more limited color range, but is also the only one that offers hand-dyed multicolors

Tsuki and Silk Cloud have the highest silk content, Aloft has the lowest

Silk Cloud is sold in the highest-yardage putup

I don’t think the suggested gauge or needles are significant–I’m sure these are all interchangeable

I’m not sure if the lack of “super kid” designation on Aloft was intentional. Maybe it’s scratchier than the others?

Silken Kydd is the cheapest per skein

However, Silken Kydd and Aloft are the same price per yard

Knit Picks offers free shipping for orders over $50, and shipping is pretty darn cheap even when you have to pay for it, so once you factor that in, it’s probably the cheapest choice by far… on the other hand, Shibui and KSH are sold through retailers instead of direct to consumer, so you have a better chance of finding random sales or discount codes than with the other yarns

Silk Cloud seems the most expensive but is actually quite a bit cheaper than KSH once you look at the yardage

Edited for full, FCC-compliant disclosure: after I wrote this post, the folks at Knit Picks kindly sent me 3 skeins of green Aloft yarn for free! (I didn’t know they were going to do that when I wrote it.)